fbi officials saying friendly fire was likely to blame near the arizona-mexico border and investigators say they are still looking into the case for definitive answers and, homeland security secretary janet napolitano making a trip to ivie's home, expressing her condolences to his family and several border officials joining her on the trip and the border patrol commander says he died a true hero. >> investigators made progress into the investigation into agent ivie's death. and are looking into the possibility that it was a tragic accident. the result of friendly fire. i explained to agent ivie's family that if the investigation ultimately reaches that conclusion, it changes none of the following facts. that agent ivie gave the ultimate sacrifice and died serving his country. that he died in the line of duty, and will be honored as such, for his final act of service. >> arthel: he died after he and two other agents responded to an alarm triggered by a sensor aimed at detecting smugglers, another agent was wounded and the third not injured. >> rick: switching gears, the summer's drought